33Mail - Simple free disposable email address service, unlimited free disposable email addresses.
Followup.cc - FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks. Set perfectly timed reminders that arrive at the top of your inbox, right when you need them.
TempMailAddress - The TempMailAddress protects your primary mailbox. TempMailAddress.
FollowUpThen - The simplest way to schedule an email reminder
SimpleLogin - Receive and send emails anonymously. Create a unique email address for each website to avoid cross-site tracking and protect your inbox from spam, phishing and data breaches.
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.